It’s a Ronco.
Has five trays and the top lid along with the top vent. It’s missing the bottom vent, but I don’t think that’s a biggie.
I washed and bleached it good - now it is dehydrating it’s first item:
Itself!!
I got a couple loaves of really good rye bread, I might try some of that first.
No, you don’t have to worry about the missing bottom vent.
youtube is chock full of dehydrator recipes and ideas!